Hydraulic vise



Aug. 31, 1943 F. W. CURTIS HYDRAULIC VISE Filed Nov. 16, 1942 2 Sheets-Sheet l HRQPQR m INVENTOR lbw/r WwRr/a ATTOREYS Aug. 31, 1943. F. w. CURTIS 2,328,061-

HYDRAULIC VISE Filed Nov. 16, 1942 2 Sheets-Sheet 2 I W f INVENTOR FPA/Wr Mal/ BY Patented Aug.- 31, 1943 I j ],\2;s2s,0e1

'flYDRAULIC"viSE 1 s Cm'tis, Springfield, Mass, assigno'r to 19 i i VansNorman Machine Tool Company, Spa-h1g .field luass atcorporation ofMassachusetts. Application-November 16, ima ser arnassssss r L2;C.laims.. (01.90 it l This'invention relates tovisesirsedonf machine tools to hold the *work in position on the bedor liable (if the machine. I y i The principal object of the invention is to a and-efficientvisefor this purpose hitherto beennyafiable.

* Other and further-objects residing in details of motion 'willbe apparentirom the following specification and claimsl In the accompanyln drawmgs whicliillustrate oneembodiment-o'f'the invention,

Fig. 1 is a plan view'of the vise; Fig. 2 is a side elevational view of the structure l Fig. 3 is a sectional view'substantially on line 3-8 of Fig. 1; t

Fig. 4 is a sectional view substantially on line 4--4 of F18. 1;

on line 66 of Fig. respectively showing three positions of the control valve; and

Fig. 9 is a sectional view substantially on line 1 9-4 ofFig. 5. Referring to the wdrawings, I0 indicates the jwork supporting table of the machine tool upon which the vise is to be used, and it will be under- 'I'heiaws II and ,I2 of the vise are carried by a support I3 adjustably mounted on the table l0 in any suitable manner as by bolts I4. having heads l5 engaging in the usual T-slots l6 in the table. Jaw I2 is provided on its under face with a plurality of transverse ribs I8 adapted to engage cooperating ribs 19 formed on the face of support I3. Jaw i2 is clamped in adjusted position on the ribbedportion of the support by bolts 20 extending through slots 2| in the support.

Blextending "throughblocklfi. The end of 1'8- ducedportion 3i isthreadedtoreceive nut 32 by whichthe end of rod 36 is rigidly clamped tothe block, a spline 33 preventing rotation of'th rod in the block; The opposite e'nii of rod 36 is. slabbedofi and provided with rack teeth 34 engaging "a small pinion35 fixed on a vertical shaft 36; Shaft 36 is jou'rnaled to rotate 'in -a cylindrical chamber 31 formed in support 13, chamber 31 being c'iosed by acover plate 38 secured by machine screws; Rot-1'56 extends through a bore 4fl,-in t he wa1l of chamber 31, which guides and supper-esteem; endfof the rod. A second andlarger pinion 42 is securedtos'haftflfi and is engaged by a rack 43 formed on a slabbed ofi end portion of a rod 44,,guided in a bore 45 in the wall of chamber 31. The other end of rod 44 is connected to a piston head 46 operating in a cylinder 48mounted by means of screws 49 on support l3. Fluid pressure isadmitted to cylinde'r 48 to operate piston 46 by a control valve 56 built into the head of the cylinder. Valve 50 comprises a central chamber 5 tin which valve member 52 is rotatably mounted. Fluid pressure is supplied to the valve chamber through pipe 53 and passage 54 and exhausted through passage 55 and pipe 56. Apassage 51 connects the valve chamber to the cylinder atthe forward side of i the rear of piston 46 through' passage 54 adja- The jaw Ii is slidably mounted on the surface and by machine bolts 25 which extendthrough slots .26 in the support and I are threaded into guide blocks 21 engaging the .under side of the support, as best shown in Fig. 3. The bolts are cent groove 63 and passage 58 at the same. time that the forward end of the piston is exhausted through passage 51 and passages 60 and 56, thus driving the piston 46 to the right in Fig. 1 and imparting clockwise rotation to the pinions 42 sages 54, 60 and 51 at the same time that the rear side of the piston is exhausted through paspreferably shouldered at 28 to keep the/proper spacing of the guide blocks to permit reciprocation of the jaw on the support. i

sages 58, 6| and 56, thus driving piston 46 to the left in Fig. 1 and imparting counterclockwise rotation to the pinions 42 and 35 to move rod 40 to the right, whereby the jaws of. the visa are drawn together.

When valve member 52 is inthe neutral position shown in Fig. 8, that is in a position interis provided with a lug 10 adapted to engage a stop pin H when the'valvemember 52 is in the vise opening position of Fig. 6 and to engage a stop pin 12 when the member 52 is in the vise closing position of Fig. 7.

It will be apparent that a given movement of the piston 46 will produce a much less movement of jaw H due to the difierence in size of the gears 35 and 42. This-both reduces the necessary diameter of cylinder 48 and increases the available power. Furthermore, the stress in rod 30 being greater than in. rod 44, an undesirable increase in the size of the former is avoided by the fact that it is in tension rather than com pression during the working stroke.

What I claim is:

' 1. A, hydraulic vise for machine tools and the like comprising a base portion, a vise jaw stationarily mounted on the base portion, a second vise jawslidably mounted on the base portion, a hydraulic cylinder mounted on the base portion on thatside of the stationary jaw remote from the movable jaw, a piston in the cylinder, a piston rod attached to the piston and having rack teeth formed thereon, a rod attached to the movable vise jaw and having rack teeth formed thereon, multiplying gearing connecting the two rods whereby the piston rod will be constrained to move faster than the second rod, and valve means controlling the admission of pressure fluid to said cylinder.

2. A hydraulic vise for machine tools and the like comprising a base portion, a series of transverse ribs and grooves formed thereon, a vise jaw having a series of transverse ribs and grooves interfitting selectively with certain of those on the base portion, means for clamping said vise jaw adjustably in position on the base portion,

piston rod attached to the piston and having rack teeth formed on one side thereof so as to face towards the central plane of the jaws, a rod attached centrally to the movable vise jaw and having rack teeth formed on one side thereof so as to face the rack teeth on the piston rod, a pair of unequal gears rotatably mounted on the base portion between the two rods,,the larger of said bears meshing with the rack teeth on the piston rod and the smaller of said gears meshing with the teethon the second rod, and valve means controlling the admission of pressure fluid to saidcylinder,v

YFRANK- w, CllRTIS. 

